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Re: GRIDDATA woes [message #59036 is a reply to message #59035]

Tue, 04 March 2008 09:43

wgallery
Messages: 32
Registered: December 1998

Member

On Mar 4, 12:05 pm, David Fanning <n...@dfanning.com> wrote:
> Bill Gallery writes:
>> Ben,
>
>> 1. There is an error in your routine to generate longitude.
>
>> ;;lon = FINDGEN(nLon)/(nLon-1) * PS[0] + lonRange[0]
>> lon = fINDGEN(nLon) * PS[0] + lonRange[0]
>
>> Otherwise, lon has only two unique points
>
>> 2. Try using the first form of grid_data: without /sphere:
>
>> ;filter and reorder the data
>> ;;GRID_INPUT, lon, lat, zValue, xyz, newZ, /SPHERE, /DEGREES, EPSILON
>> = PS[0]/2.0
>> GRID_INPUT, lon, lat, zValue, x1, y1, newZ, /DEGREES, EPSILON = PS[0]/
>> 2.0
>
>> ;build the triangulation
>> ;;QHULL, xyz[0,*], xyz[1,*], tr, /DELAUNAY
>> QHULL, x1, y1, tr, /DELAUNAY
>
>> ;interpolate
>> ;;Z = GRIDDATA(xyz[0,*], xyz[1,*], newZ, /SPHERE,/DEGREES, $
>> Z = GRIDDATA(x1, y1, newZ, /SPHERE,/DEGREES, $
>> METHOD = "NaturalNeighbor", MISSING = !VALUES.F_NAN, $
>> XOUT = oLon, YOUT = oLat, TRIANGLES = tr )
>
>> You will no longer get the dreaded "Triangle 0 not in counterclockwise
>> order" error.
>
> Well, actually, I *did* still get the error. And I continued to
> get it until I removed the SPHERE keyword from GRIDDATA, too.
> Has anyone, anywhere, gotten spherical triangles to work on anything?
>
> I don't know what to say about this in my article, except
> not to ever use the SPHERE keyword if you expect to use
> these routines successfully. Any ideas?
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

My mistake: I removed /sphere everywhere except in the posted article.

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[Message index]

		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 13:14
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 11:49
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 09:54
		Re: GRIDDATA woes By: wgallery on Tue, 04 March 2008 09:43
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 09:14
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 09:05
		Re: GRIDDATA woes By: Brian Larsen on Tue, 04 March 2008 08:23
		Re: GRIDDATA woes By: ben.bighair on Tue, 04 March 2008 08:05
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 08:03
		Re: GRIDDATA woes By: David Fanning on Tue, 04 March 2008 07:35
		Re: GRIDDATA woes By: Kenneth P. Bowman on Mon, 03 March 2008 06:24
		Re: GRIDDATA woes By: wgallery on Mon, 03 March 2008 11:00
		Re: GRIDDATA woes By: Kenneth P. Bowman on Tue, 04 March 2008 19:04
		Re: GRIDDATA woes By: Kenneth P. Bowman on Tue, 04 March 2008 19:02
		Re: GRIDDATA woes By: wgallery on Tue, 04 March 2008 14:17
		Re: GRIDDATA woes By: Kenneth Bowman on Wed, 05 March 2008 06:14
		Re: GRIDDATA woes By: Kenneth P. Bowman on Tue, 04 March 2008 18:55
		Re: GRIDDATA woes By: ben.bighair on Tue, 04 March 2008 14:46
		Re: GRIDDATA woes By: pgrigis on Tue, 04 March 2008 14:39

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